Answer / Rajneesh Singh

The three main components of LINQ are: 1) Query Operators (e.g., Select(), Where(), OrderBy()) - they provide a uniform syntax for querying various data sources. 2) Extension Methods - they allow developers to extend existing types with new functionality, simplifying working with different data structures. 3) Lambda Expressions - they provide an easy way to define anonymous functions that can be used within queries. When using LINQ to SQL, the file extension is .dbml or .csdl for the metadata and conceptual schema files, respectively.

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